CheungsLegoCreation

Thanks Heppu. Basically I used the Powered Up App to setup the control. The legs and shoulder movements are all connected to one hub and the arms are done using another hub. Buttons are used for controlling movements (front, back, left and right), vertical sliders are used to raising the shoulder and arms, buttons are used for opening and closing the hands. I mainly used the mindstorms hub for prototyping and then convert the design into one using the control+ hubs. Obviously the main disadvantage of this approach is I need to factor in the weight of the batteries and sometimes it would require redesign (in this case I need to increase the width of the feet to make it tilt less as it walks otherwise it could flip sideway). I am working on a mech that hopefully will use a single hub (4 ports) and yet will perform pretty much similar actions (to a certain degee) but it will take at least a few weeks though. Programming using Pybrick could be easier (which I have not tried) and I am not sure if I can connect to 2 hubs at the same time using the web programming interface. I guess I will just have to try and see what happens. Happy building!

Hi all, Long time no post ;) And here's my latest powered up based mech, utilising 2 technic hubs and 8 motors. 3 motors are used for walking and turning, 1 motor is for raising the arms and moving the antenna, the rest of the motors are for arms movement. Compare to my previous bot, this bot features wider feet, allowing the mech to walk with less body tilt. I hope you will enjoy watching the video. If you have any question about it ask away :) Take care and happy building. Cheung :)

Thanks 2GodBDGlory. I love the fact that Control+ allows me to send commands to multiple hubs at the same time, unlike the 51515. But the weight of the battery is definitely a factor in limiting the number of hubs I can use (the bot may not be able to move if carrying too many battery boxes), I guess that's where the 51515 hub is better due to the lighter weight of the battery. I will definitely try to add another battery box (an another 4 motors) to it, let's hope the bot can hold up. Happy building!

Hi all, I would like to introduce you to my latest biped based on the Powered Up platform. Here's a copy and pasted quick introduction - Introducing Bot 7 - My 7th generation LEGO Powered Up humanoid biped. The bot is built with 8 Technic Large motors. Bot 7 has 6 DOF for leg movement and 2 motors for shoulder joint and arm movement. The bot has been programmed using the Powered Up app. Battery boxes have been placed on the side of the bot to improve body tilting for movement and provide stability when the bot perform a hip + knee tilt. This bot features - * Large step size continuous movement (forward, backward, left and right turn) * 360 degrees shoulder movement * 270 degrees arm movement * Incredible hip + knee tilt without touching the ground * a highly recognisable t-shirt 7 :) Comments are welcome, happy building! /cheung

Thanks Jim. I am interested in seeing what I can come up with for the next iteration too :). It may be possible to use those smaller motors (those that look like a cube) to make the bot smaller but I am not too eager to spend $$$ on them given those motors are likely to have less torque then the current motors. /cheung

@oracid Thanks for the link to the code. It is impressive such a small amount of code can do that much :)

Amazing work. Well done!

Hi all, It's me again with yet another iteration of my new biped (generation 6, that's why it's called Bot 6). This time the bot is built using 2 separate hubs communicated via the hub to hub block. It is a challenge to create a set of legs that can drive under high load and that's why this guy moves slower than Bot 5 (which uses only a single hub). Shock absorbers are also added to each leg and a leg separator (a 7 unit beam) has been inserted to prevent the feet from rubbing against each other. Hopefully I will be able to come up with a better movement mechanism in the next iteration. Enjoy the video and happy building! /cheung

This looks really cool and the line follower is definitely very quick. How much programming is needed to get this going?

Hi all, Long time no post. Hope you have all been well. This is my 5th generation bot Bot 5 featuring a variable step distance of 2, 4 and 6 units. This is almost similar to Bot 3 I built a couple of months ago except for a much more stable body tilt mechanism. The step size can also change during movement. Although it moves slower than Bot 3, the movement design should allow it to handle more load (I am planning to attach yet another hub on the bot and use the new hub to drive more motors / sensor - will just have to see how it goes). As always, feedbacks are welcome and HAPPY BUILDING! Regards, Cheung 8)

Thanks Gimmick. This is a work in progress and I am hoping the next change would allow it to pick up "golf ball" by doing object detection. It could take a few months to do it though since I am new to python and there are still lots for me to learn. Hi Philipp_83, my code is very messy at the moment and it's probably not in its best form for sharing. That being said my code was based on information from https://mobile.twitter.com/biglesp/status/1260872904771854336 It contains an example on how to use pyserial to connect to the technic hub from RPi.

Hi all, I did some small updates to my bot over the past few weeks and the video below shows how the bot is looking now - [media] The bot's height has increased and I have added a extendable grabber and a tiltable camera. Hopefully in a few weeks time I will be able add object detection / tracking to it. Take care and happy building! /cheung

Hi all, I am happy to introduce my first version of RPi 4 based mindstorms bot. The bot consists of a Rpi4b, Rpi4b camera, Rpi BuildHat, RPi SenseHat and a Mindstorms 51515 hub. The buildhat is mainly used as an interface to supply power to the Pi (2 x 18650) and is NOT used for driving the motors due to issues with its Python API. The pi runs a python based web server and exposes a web interface. This interface shows a live stream view of the camera and can be used to drive the bot. The SenseHat at the front displays message entered through the text control. When a key is pressed on the web interface, a http request is sent to the web server and perform the corresponding action. Commands are sent to the Mindstorms hub using PySerial via the hub's REPL interface. Future improvement include a nicer web interface (the one shown in the video is essentially a quick hack). A tilt-able camera head and a hand to pick stuff up. The current setup I have would allow me to connect up to 10 motors / LPF2 devices. Questions / comments are welcome!

Thanks. Strange enough the torso-arm distance doesn't seem to make any difference because the bot is centre heavy (torso is 2XL motors + 2 hubs with 12AAs). I think the tilt would work better if the linear actuators on the foot are placed near the outer edge of the feet. With the heavy body the stride length has to be reduced to 5 units instead of 7 units my earlier version could do (as the gears connecting to the XL motors starts to slip due to the weight - that is, it could lift the body using a single motor).

Hi Jos, Thanks for your feedback. Initially I tried tilting both feet at the same time but the weight of the bot doesn't really allow it to be tilted as the torso is too heavy (12AA + 6 motors). Perhaps I could also remove the foot tilt of the non standing foot once the bot has been tilted too. Time to try it out 🙂